TW201631996A - RRM based on signal strength measurements in LTE over unlicensed spectrum - Google Patents

Abstract

UE-aided channel selection within unlicensed frequency bands. A base station may communicate with UEs using LTE/LTE-A carrier waveforms (e.g., configured as a secondary cell) in the unlicensed frequency band. The base station may configure UEs for wide-band interference feedback for channels in the unlicensed frequency band. The measurements of wide-band signal strength may be performed by the UEs on channels for which the base station is not currently transmitting, or during silent periods of a configured secondary cell. The UEs may feedback an average total received power over a measurement bandwidth for one or more frequency channels of the unlicensed frequency band. The base station may receive the wide-band signal strength feedback from the UEs and identify potential frequency channels for channel selection for the secondary cell based on its own measurements of the candidate channels, and the wide-band signal strength feedback from the UEs.

Description

Radio resource management based on signal strength measurement on LTE unlicensed spectrum Cross reference

U.S. Patent Application Serial No. 15/004,672, entitled "RRM BASED ON SIGNAL STRENGTH MEASUREMENTS IN LTE OVER UNLICENSED SPECTRUM", by Vajapeyam et al., issued January 22, 2016, and Vajapeyam et al. The priority of U.S. Provisional Patent Application Serial No. 62/109,921, entitled "LTE-U RRM BASED ON SILENT INTERFERENCE MEASUREMENTS", is hereby assigned to the assignee.

The following is generally related to wireless communications, and more specifically to radio resource management (RRM) based on quiet interference measurements on LTE unlicensed spectrum.

Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and the like. Such systems may be multiple access systems capable of supporting communication with multiple users by sharing available system resources (eg, time, frequency, and power). Examples of such multiple access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, and orthogonal frequency division multiple access (OFDMA) systems. (for example, LTE system).

By way of example, a wireless multiple access communication system can include multiple base stations, each Communication for multiple communication devices is also supported, which may be otherwise referred to as user equipment (UE). The base station can communicate with the communication device on a downlink connection channel (e.g., for transmission from the base station to the UE) and an uplink connection channel (e.g., for transmission from the UE to the base station).

Wireless communication systems can use a variety of Radio Resource Management (RRM) technologies. For example, spectrum resources may be assigned by fixed channel allocation (FCA) or dynamic frequency selection (DFS). Honeycomb networks tend to use FCA operations in licensed bands. DFS can be applied to wireless networks with several adjacent decentralized controlled access points or devices. The access point or device can use DFS to select a frequency channel with a low interference level. DFS is supported by various IEEE 802.11 wireless local area network (WLAN) protocols. DFS may also be licensed in certain frequency bands used to avoid other transmissions (eg, radar, etc.). In general, the DFS handler can also be referred to as channel selection.

As data traffic in cellular networks using licensed RF spectrum bands increases, at least some of the data traffic is offloaded to the unlicensed RF spectrum band, which can be a cellular operator (eg, Public Land Mobile Network (PLMN)) Or an operator that defines a coordinated set of base stations for a cellular network (such as an LTE/LTE-A network) to provide enhanced data transmission capabilities. The use of an unlicensed RF spectrum band may also provide service in areas where access to the licensed RF spectrum band is not available. In some cases, a cellular network may utilize carrier waveforms similar to those used in multiple access cellular communication systems over unlicensed spectrum. For example, the network may use an LTE/LTE-A cell in an unlicensed spectrum, which may be referred to as an unlicensed LTE (LTE-U) operation. However, performing channel selection on an LTE-U cell without causing substantial interference or receiving substantial interference from other users of the unlicensed spectrum may present challenges.

Systems, methods, and apparatus for UE assisted channel selection within an unlicensed band are described. The base station can use the LTE/LTE-A carrier waveform in the unlicensed band (for example, Configured as a secondary cell) to communicate with the UE. The base station can configure wideband interference feedback by the UE served by the base station, which can be configured for communication via the secondary cell. The UE may perform wideband interference measurements during a channel that the base station is not currently transmitting (e.g., a candidate channel for channel selection, etc.) or during a signal strength measurement period of the secondary cell. The UE may feed back the average total received power on the measurement bandwidth of one or more frequency channels of the unlicensed band. The base station may receive wideband interference feedback from the UE and identify possible frequency channels for channel selection for the secondary cell based on its own measurement of the candidate channel and wideband interference feedback from the UE.

Describe a method of wireless communication. The method can include identifying, at a user equipment (UE), a configuration for reporting a measurement value for channel selection assistance for at least one frequency channel to a base station, wherein the configuration includes indicating a plurality of signal strength measurement periods Timing information; performing broadband measurement on at least one of the at least one frequency channel according to the configuration during the plurality of signal strength measurement periods; filtering the broadband measurement to obtain at least one of the at least one frequency channel Each of the filtered wideband received signal strengths; and the filtered wideband received signal strength is reported to the base station.

A device for wireless communication is described. The apparatus can include means for identifying, at a user equipment (UE), a configuration of reporting a measurement value for channel selection assistance for at least one frequency channel to a base station, wherein the configuration includes indicating a plurality of signals Timing information of the intensity measurement period, the base station may suppress transmission on at least one of the at least one frequency channel for the signal strength measurement period; for performing a broadband amount on the at least one frequency channel according to the configuration a means for filtering a wideband measurement to obtain a respective filtered wideband received signal strength of at least one of the at least one frequency channel; and for reporting the filtered broadband received signal strength to The components of the base station.

Describe another device. The apparatus can include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions can be operative to cause the processor to: identify at least one of the frequency channels at the user equipment (UE) One of the channels selects an auxiliary measurement value report to the configuration of the base station, wherein the configuration includes timing information indicating a plurality of signal strength measurement periods; and is executed according to the configuration during the plurality of signal strength measurement periods Wideband measurement of at least one frequency channel; filtering the broadband measurement to obtain respective filtered wideband received signal strengths of at least one frequency channel; and reporting the filtered broadband received signal strength to the base station.

A non-transitory computer readable medium for wireless communication is described. The non-transitory computer readable medium can include instructions that cause the processor to: at a user equipment (UE) identify a measurement of a channel selection assistance for a set of frequency channels to a base station configuration, Wherein the configuration includes timing information indicating a plurality of signal strength measurement periods, and the base station transmits transmissions on at least one of the set of frequency suppression periods for the signal strength measurement periods; the frequency channel is configured according to the configuration At least one of the sets performs wideband metrology; filtering the wideband measurements to obtain respective filtered wideband received signal strengths for at least one of the set of frequency channels; and receiving the filtered wideband Signal strength is reported to the base station.

Some examples of the method, apparatus, or non-transitory computer readable medium described above may further include a program, a feature, a component, or an instruction for identifying a plurality of signal strength measurement periods based on timing information, wherein the timing information includes the UE One or more of a discontinuous reception (DRX) cycle, a measurement timing configuration indicating a timing of a plurality of signal strength measurement periods, or a discovery reference signal (DRS) configuration of a cell.

In some examples of the method, apparatus, or non-transitory computer readable medium described above, performing wideband measurements of at least one or more frequency channels includes measuring across a plurality of signal strength measurement periods One or more of the total power received by the bandwidth of the serving cell or the total power received by the bandwidth of the candidate frequency channel in the set of frequency channels not currently used for communication of the base station.

Some examples of the method, apparatus, or non-transitory computer readable medium described above can further include identifying a trigger to report the filtered broadband received signal strength to the base A program, feature, component, or instruction that reports an event. In some examples of the method, apparatus, or non-transitory computer readable medium described above, the reporting event includes one or more of the following: the wideband received signal strength measurement of the base station's serving cell is greater than The first threshold, the broadband received signal strength measurement value of the serving cell is smaller than the second threshold, and the broadband received signal strength measurement of the candidate frequency channel in the set of frequency channels not currently used by the base station for communication The value is less than the third threshold, or the broadband received signal strength measurement of the candidate frequency channel plus the difference is smaller than the wideband received signal strength measurement of the serving cell.

In some examples of the method, apparatus, or non-transitory computer readable medium described above, reporting the filtered wideband received signal strength comprises periodically reporting the filtered wideband received signal strength according to a channel selection assistance reporting period.

In some examples of the methods, apparatus, or non-transitory computer readable media described above, the set of frequency channels includes at least one candidate frequency channel that is not currently used for communication by the base station.

In some examples of the methods, apparatus, or non-transitory computer readable media described above, the set of frequency channels includes channels of unlicensed bands.

Describe a method of wireless communication. The method can include configuring at least one UE by the base station to report a measurement value for channel selection assistance for the at least one frequency channel, wherein the configuring includes transmitting timing information indicating a plurality of signal strength measurement periods, the base station Suppressing transmission on at least one frequency channel for the plurality of signal strength measurement periods; receiving UE wideband received signal strength information measured according to timing information from at least one UE; determining signal strength of at least one frequency channel by measuring The base station broadband signal strength information; and the frequency channel for the secondary cell of the base station is identified based at least in part on the base station wideband received signal strength information and the UE received signal strength interference information.

A device for wireless communication is described. The apparatus can include: configured to configure at least one UE by a base station to report channel selection assistance for at least one frequency channel a component of the measurement value, wherein the configuration includes transmitting timing information indicating a plurality of signal strength measurement periods, and the base station suppresses transmission on the at least one frequency channel for the plurality of signal strength measurement periods; and is configured to receive from at least one UE a component for receiving signal strength information of a UE broadband according to timing information; means for determining base station broadband signal strength information by measuring signal strength of at least one frequency channel; and for at least partially based on a base station The broadband received signal strength information and the UE received signal strength interference information identify components of the frequency channel used for the secondary cell of the base station.

Describe another device. The apparatus can include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be operable to cause the processor to: configure at least one UE by the base station to report a measurement value for channel selection assistance for at least one frequency channel, wherein the configuration includes transmitting a plurality of indications The timing information of the signal strength measurement period, the base station suppresses the transmission on the at least one frequency channel for the plurality of signal strength measurement periods; and receives the UE broadband signal strength information measured according to the timing information from the at least one UE; Measuring signal strength of at least one frequency channel to determine base station broadband signal strength information; and identifying a frequency channel for a secondary cell of the base station based at least in part on the base station wideband received signal strength information and the UE received signal strength interference information .

A non-transitory computer readable medium for wireless communication is described. The non-transitory computer readable medium can include instructions that cause the processor to: configure at least one UE by the base station to report a channel selection assistance for the set of frequency channels, wherein the configuration includes a transmission indication The timing information of the plurality of signal strength measurement periods, the base station transmits the transmission on at least one of the set of the plurality of signal strength measurement period suppression frequency channels; and receives the UE broadband measured according to the timing information from the at least one UE With the received signal strength information; determining the base station wideband signal strength information by measuring the signal strength of the set of frequency channels; and identifying the base station based on the base station wideband received signal strength information and the UE received signal strength interference information The frequency channel of the class cell.

Some examples of the method, apparatus, or non-transitory computer readable medium described above may further include a processing program, feature for transmitting transmission on at least one of a set of frequency suppression periods for a plurality of signal strength measurements , component or instruction.

In some examples of the method, apparatus, or non-transitory computer readable medium described above, the timing information includes a DRX cycle of at least one UE, a measurement indicating a timing of a plurality of signal strength measurement periods of the at least one frequency channel One or more of the timing configuration or at least the frequency channel's discovery reference signal (DRS) configuration.

In some examples of the method, apparatus, or non-transitory computer readable medium described above, configuring the at least one UE comprises transmitting any of: to at least one UE: identifying that is not currently being used by the base station The frequency information of the candidate frequency channel of the unlicensed band of communication, the wideband received signal strength reporting period, the filtered measured wideband received signal strength to obtain the filter coefficient of the filtered wideband received signal strength, or a combination thereof.

In some examples of the method, apparatus, or non-transitory computer readable medium described above, at least one UE includes a set of UEs being served by a primary cell of a base station, and wherein a frequency channel for the secondary cell is identified The frequency channel with the lowest combined interference level is determined based on the base station wideband received signal strength information and the received UE broadband received signal strength information.

In some examples of the method, apparatus, or non-transitory computer readable medium described above, the one or more frequency channels include at least one candidate frequency channel of an unlicensed frequency band that is not currently being used by the base station for communication. In some examples of the methods, apparatus, or non-transitory computer readable media described above, the set of frequency channels includes channels of unlicensed bands.

The concepts and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for the same purpose. Such equivalent constructions do not depart from the scope of the appended claims. The nature of the concepts disclosed herein will be better understood from the following description in conjunction with the <RTIgt; figure Each of these is provided for the purpose of illustration and description only and is not a limitation of the scope of the claims.

100‧‧‧Wireless communication system

105‧‧‧Base station

105-a‧‧‧ base station

105-b‧‧‧ base station

105-c‧‧‧Base Station

105-m‧‧‧ base station

105-n‧‧‧ base station

110‧‧‧Geographically covered areas

115‧‧‧User equipment

115-a‧‧‧User equipment

115-b‧‧‧User equipment

115-c‧‧‧User equipment

115-d‧‧‧User equipment

115-e‧‧‧User equipment

115-f‧‧‧User equipment

115-g‧‧‧User equipment

115-h‧‧‧User equipment

125‧‧‧Communication links

130‧‧‧core network

130-a‧‧‧core network

132‧‧‧No-load transmission link

134‧‧‧No-load transmission link

150‧‧‧Wi-Fi access point

150-a‧‧‧Wireless Area Network Access Point

200‧‧‧Wireless communication environment

225‧‧‧Main Community

230‧‧‧Secondary community

230-a‧‧‧Secondary community

230-b‧‧‧secondary community

250‧‧‧Basic service collection

255‧‧‧Wireless links

300‧‧‧ Process flow

305-a‧‧‧Broadband Interference Reporting Configuration

305-b‧‧‧Broadband Interference Reporting Configuration

310‧‧‧Broadband interference measurement

310-a‧‧‧Broadband interference measurement

310-b‧‧‧Broadband interference measurement

315-a‧‧‧Filter

315-b‧‧‧Filter

320‧‧‧Broadband interference measurement

325‧‧‧ Filter

330‧‧‧Broadband Interference Feedback Report

330-a‧‧‧Broadband Interference Feedback Report

330-b‧‧‧Broadband Interference Feedback Report

335‧‧‧ channel selection

400-a‧‧‧ Timing Chart

400-b‧‧‧ Timing Chart

425‧‧‧Transmission

435‧‧‧Signal strength measurement period

435-a‧‧‧Signal strength measurement period

435-b‧‧‧Signal intensity measurement period

435-c‧‧‧Signal intensity measurement period

440‧‧‧ candidate channel

440-a‧‧‧ candidate channel

440-n‧‧‧ candidate channel

455‧‧‧LTE/LTE-A carrier waveform

460‧‧‧Resource Block

465‧‧‧Broadband Interference Reference Signal Resources

500‧‧‧ Timing diagram

510‧‧‧ threshold

515‧‧‧ threshold

520‧‧‧Differential

530‧‧‧Secondary cell interference

540‧‧‧Candidate frequency interference

550‧‧‧First report

555‧‧‧ second report

560‧‧‧ Third Report

600‧‧‧Wireless devices

605‧‧‧ Receiver

605-a‧‧‧ Receiver

610‧‧‧Broadband Interference Manager

610-a‧‧‧Broadband Interference Manager

610-b‧‧‧Broadband Interference Manager

615‧‧‧Transporter

615-a‧‧‧Transmitter

620‧‧‧Information

620-a‧‧‧Information

625‧‧‧ signal

625-a‧‧‧ signal

700‧‧‧Wireless devices

705‧‧‧Broadband Interference Feedback Configuration Manager

705-a‧‧‧Broadband Interference Feedback Configuration Manager

710‧‧‧Broadband Interference Measurement Manager

710-a‧‧‧Broadband Interference Measurement Manager

715‧‧‧Broadband interference filter

715-a‧‧‧Broadband interference filter

720‧‧‧Broadband Interference Reporter

720-a‧‧‧Broadband Interference Reporter

725‧‧‧Measurement timing information

725-a‧‧‧ Timing Information

730‧‧‧Interference measurement

730-a‧‧‧Interference measurement

735‧‧‧ Filtered measurement

735-a‧‧‧ Filtered measurements

800‧‧‧block diagram

805‧‧‧Discontinuous Receive Configuration/Broadband Interference Timer

810‧‧‧Found reference signal configuration

815‧‧‧ Received signal strength indicator measurement timing configuration

820‧‧‧Broadband interference measurement timer

900‧‧‧ system

905‧‧‧ processor

910‧‧‧Broadband Interference Manager

915‧‧‧ memory

920‧‧‧Software/software code/firmware code

935‧‧‧ transceiver

940‧‧‧Antenna

945‧‧ ‧ busbar

1000‧‧‧Wireless devices

1005‧‧‧ Receiver

1005-a‧‧‧ Receiver

1010‧‧‧Base Station Broadband Interference Manager

1010-a‧‧‧Base Station Broadband Interference Manager

1010-b‧‧‧Base Station Broadband Interference Manager

1015‧‧‧Transmitter

1015-a‧‧‧Transmitter

1020‧‧‧Information

1020-a‧‧‧Information

1025‧‧‧ signal

1025-a‧‧‧ signal

1100‧‧‧Wireless devices

1105‧‧‧Channel Selection Feedback Configuration Manager

1105-a‧‧‧Channel Selection Feedback Configuration Manager

1110‧‧‧Configuration Information

1110-a‧‧‧Configuration Information

1115‧‧‧Signal intensity measurement cycle information

1115-a‧‧‧Signal intensity measurement cycle information

1120‧‧‧Cell suppression manager

1120-a‧‧‧Cell suppression manager

1125‧‧‧UE wideband received signal strength information

1125-a‧‧‧UE wideband received signal strength information

1130‧‧‧Channel Selection Measurement Manager

1130-a‧‧‧Channel Selection Measurement Manager

1135‧‧‧Gathering interference information

1135-a‧‧‧Gathering interference information

1140‧‧‧Channel Selection Manager

1140-a‧‧‧Channel Selection Manager

1200‧‧‧block diagram

1205‧‧‧Channel selection measurement timer

1210‧‧‧Measurement timing information

1215‧‧‧Configuration Selection Manager

1300‧‧‧ system

1305‧‧‧ Processor

1310‧‧‧Broadband Interference Manager

1315‧‧‧ memory

1320‧‧‧Software/software code

1325‧‧‧Base Station Communication Manager

1330‧‧‧Network Communication Manager

1335‧‧‧ transceiver

1340‧‧‧Antenna

1345‧‧‧ busbar system

1400‧‧‧ method

1405‧‧‧ Block

Block 1410‧‧‧

1415‧‧‧ Block

1420‧‧‧ Block

1425‧‧‧ Block

1500‧‧‧ method

1505‧‧‧ Block

1510‧‧‧ Block

1515‧‧‧ Block

1520‧‧‧ Block

1525‧‧‧ Block

1600‧‧‧ method

1605‧‧‧ Block

1610‧‧‧ Block

1615‧‧‧ Block

1620‧‧‧ Block

1625‧‧‧ Block

A further understanding of the nature and advantages of the present invention can be realized by reference to the drawings. Similar components or features may have the same reference numerals in the accompanying drawings. In addition, various components of the same type can be distinguished by adding a dash after the reference mark and a second mark that distinguishes between similar components. If only the first reference mark is used in the specification, the description applies to any of the similar components having the same first reference mark irrespective of the second reference mark.

1 illustrates an example of a wireless communication system in accordance with various aspects of the present invention; FIG. 2 illustrates an example of a wireless communication environment in accordance with various aspects of the present invention; and FIG. 3 shows UE assisted in accordance with various aspects of the present invention. Example flow of channel selection; FIG. 4A illustrates an example timing diagram of wideband interference measurements for channel selection in an unlicensed band in accordance with various aspects of the present invention; FIG. 4B illustrates various aspects in accordance with the present invention. Example timing diagram for broadband interference measurement for channel selection in unlicensed frequency bands; FIG. 5 is a diagram showing an example timing diagram for reporting broadband interference feedback in accordance with various aspects of the present invention; FIG. 6 shows A block diagram of various aspects of a wireless device configured to provide wideband interference feedback for channel selection in an unlicensed frequency band; Figure 7 shows a provision in accordance with various aspects of the present invention for use in an unlicensed band A block diagram of a wideband interference feedback wireless device for channel selection; FIG. 8 shows broadband interference feedback for channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. Block diagram of a broadband interference manager; Figure 9 shows various aspects of the invention in accordance with the present invention configured to provide for unauthorized use A diagram of a system of UEs for channel-selected wideband interference feedback in a frequency band; FIG. 10 is a block diagram of a wireless device configured to perform channel selection in an unlicensed frequency band in accordance with various aspects of the present invention; A block diagram of a wireless device for performing channel selection in an unlicensed frequency band in accordance with various aspects of the present invention is shown; and FIG. 12 shows a base station for performing channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. A block diagram of a broadband interference manager 1010-b; FIG. 13 shows a diagram of a system including a base station configured to perform channel selection in an unlicensed frequency band in accordance with various aspects of the present invention; A flowchart of a method for providing broadband interference feedback for channel selection in an unlicensed frequency band in accordance with various aspects of the present invention; FIG. 15 is a diagram showing the provision of various aspects in accordance with the present invention for use in an unlicensed band Flowchart of a method of channel-selected broadband interference feedback; Figure 16 shows a flow chart of a method for performing channel selection in an unlicensed band in accordance with various aspects of the present invention .

A system, method or apparatus for UE assisted channel selection within an unlicensed band is described. Several unlicensed bands support multi-channel operation using Dynamic Frequency Selection (DFS) or channel selection. For example, the 5 GHz band is considered for operation in accordance with an LTE-based protocol (which may be referred to as Unlicensed LTE (LTE-U)). Efficiently performing channel selection can be a key enabler for LTE/LTE-A technology and other radio access technologies (RATs) coexisting in unlicensed bands. Suitable channel selection techniques may enable LTE-U base stations (eg, using base stations for LTE-based protocols for communication via unlicensed spectrum, or based on communications for communication via both unlicensed spectrum and licensed spectrum) The base station of the LTE protocol can avoid receiving interference/interference to other LTE-U base stations or devices or devices using other RATs (eg, Wi-Fi) using the same frequency band. Based only on the amount at the base station The measured channel selection may not be sufficient for the best performance and coexistence of using channel selection. For example, the interference conditions at the UE served by the base station may be completely different from the interference conditions seen by the base station itself. In some cases, a node that is close to the serving UE, while significantly affecting UE transmission or reception, may cause less interference to the base station.

The UE secondary channel selection includes configuring the served UE to provide a measure of the interference condition at the UE, and the base station 105 may consider such measurements when performing channel selection. For example, if most of the served UEs report lower interference on a particular channel, the base station can select or reselect the secondary cells for their channels. The current feedback scheme of the LTE/LTE-A cell is for determining the strongest cell based on received signal received power (RSRP) or reference signal received quality (RSRQ) indicating an indication of the strength or quality of the signal transmitted by the base station. However, RSRP/RSRQ based measurements may not be suitable for channel selection in LTE-U because it requires LTE-U cells to be transmitted on the channel. Transmission of signals for R5RP/RSRQ measurements can disrupt interference conditions. For example, other nodes may retreat when sensing this transmission, and the channel may appear "clearer" than would be the case if it were transmitted on the channel without the base station.

The described embodiment includes reporting feedback from the UE, the feedback including interference metrics for a plurality of signal strength measurement periods of the serving cell or other candidate channels for unlicensed bands on which the UE is currently not configured to communicate. The interference metric may include an indication of broadband interference of a channel of an unlicensed band (eg, Received Signal Strength Indicator (RSSI), etc.). Wideband interference can be measured over frequency resources across frequency channels, and wideband interference can be measured over a subset or all symbols (e.g., subframes, etc.) used for the measurement period. Alternatively, the base station may suppress a subset of resources of the cell (eg, muted CSI-RS resources) and may measure wideband interference on the suppressed resources. The base station can configure the UE with the measurement timing information indicating a plurality of signal strength measurement periods. The measurement timing information may include a discontinuous reception (DRX) cycle of the UE, a discovery reference signal (DRS) timing of the cell, or a measurement timing configuration in which the base station will suppress transmission. The base station suppresses transmission during a plurality of signal strength measurement periods (example) For example, not transmitting on any resources on the channel), receiving a broadband interference indication of the frequency channel seen by the UE, and identifying, based on its own measurement and the reported broadband interference information, for selecting or reselecting the secondary cell. Channel.

In some cases, the measurement timing configuration may include RSSI Measurement Timing Configuration (RMTC) or DRS occasion configuration. The DRS scenario configuration can include a DRS Measurement Timing Configuration (DMTC) window and indicate when the DRS will be transmitted. The RMTC and/or DRS scenario configuration can be applied to configured secondary cells or candidate frequencies (eg, unconfigured frequency channels, etc.). In some cases, the RMTC may include a set for measuring and reporting average received power (eg, RSSI) and/or channel occupancy (eg, the percentage of measured samples for which the RSSI may exceed the threshold) in the reporting interval. State parameters.

The UE may perform periodic wideband interference measurements for one or more frequency channels of the unlicensed band, filter the measurements, and feed back an indication of the filtered interference (eg, RSSI, etc.). Reports for broadband interference measurements can be periodic, aperiodic, or can be triggered by a report trigger. For example, if the broadband interference measurement value of the secondary cell is smaller than the first threshold, the broadband interference measurement value of the secondary cell is greater than the second threshold, and the broadband interference measurement value of the candidate frequency channel is smaller than The third threshold value, the broadband interference measurement value of the candidate frequency channel plus the difference is smaller than the broadband interference measurement value of the secondary cell, the broadband interference of the secondary cell becomes higher than the threshold value, and the candidate channel is simultaneously A report can be triggered when another (eg, smaller) threshold and the like are exceeded.

The following description provides examples and is not intended to limit the scope, applicability or examples set forth in the claims. Variations in the function and configuration of the elements discussed can be made without departing from the scope of the invention. Various examples may omit, substitute, or add various programs or devices as appropriate. For example, the methods described may be performed in an order different than that described, and various steps may be added, omitted or combined. Again, features described with respect to some examples may be combined in other examples.

1 illustrates an example of a wireless communication system 100 in accordance with various aspects of the present invention. The wireless communication system 100 includes a base station 105, at least one UE 115, and a core network 130. Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The base station 105 interfaces with the core network 130 via an empty transport link 132 (e.g., S1, etc.). The base station 105 can perform radio configuration and scheduling for communication with the UE 115, or can operate under the control of a base station controller (not shown). In various examples, base stations 105 can communicate with each other directly or indirectly (e.g., via core network 130) via an empty transport link 134 (e.g., X1, etc.), which can be wired or wireless. Communication link.

The base station 105 can wirelessly communicate with the UE 115 via one or more base station antennas. Each of the base stations 105 can provide communication coverage for the respective geographic coverage area 110. In some examples, base station 105 may be referred to as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a home NodeB, a home eNodeB, or some other suitable terminology. The geographic coverage area 110 of the base station 105 can be divided into sectors (not shown) that make up only a portion of the coverage area. Wireless communication system 100 can include different types of base stations 105 (e.g., giant or small cell base stations). There may be overlapping geographic coverage areas 110 for different technologies.

In some examples, wireless communication system 100 is an LTE/Advanced LTE (LTE-A) network. In an LTE/LTE-A network, the term evolved Node B (eNB) is generally used to describe the base station 105, and the term UE is generally used to describe the UE 115. The network may include base stations 105 of different types (e.g., power classes, etc.) to provide services in different environments. A jumbo cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by the UE 115 with subscriptions to the network provider's services. In some cases, wireless communication network 100 can include a small cell that covers a coverage area in which one or more giant base stations can overlap. Small cells are lower power base stations than giant cells, and small cells may operate in the same or different frequency bands (eg, authorized, unauthorized, etc.) as the giant cells. In some cases, in areas with high user demand or in giant bases Small cells are added to areas that cannot be adequately covered by the platform. For example, a small cell may be located in a shopping mall or in an area where signal transmission is blocked by terrain or buildings. A network including both large cells and small cells may be referred to as a heterogeneous network. In some cases, small cells can improve network performance by allowing a large base station to offload traffic when the load is high. The small cell may also include a home eNB (HeNB) that may serve a restricted group called a Closed Subscriber Group (CSG). For example, an office building can contain small cells that are only used by the occupants of the building. In some cases, heterogeneous networks may involve more complex network planning and interference mitigation techniques than homogeneous networks. The term "cell" is a 3GPP term that can be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (eg, sector, etc.) of a carrier or base station, depending on the context. The eNB 105 or small cell 105 may support one or more (e.g., two, three, four, and the like) cells (e.g., component carriers).

Wireless communication system 100 can support synchronous or asynchronous operations. For synchronous operation, base station 105 can have similar frame timing, and transmissions from different base stations 105 can be substantially aligned in time. For non-synchronous operation, base station 105 can have different frame timings, and transmissions from different base stations 105 may not be aligned in time. The techniques described herein can be used for synchronous or asynchronous operations.

A communication network that can accommodate some of the various disclosed embodiments can be a packet-based network that operates according to a layered protocol stacking operation, and the data in the user plane can be IP based. The Radio Link Control (RLC) layer can perform packet segmentation and reassembly to communicate via logical channels. The Media Access Control (MAC) layer performs priority handling and multiplexing of logical channels to transport channels. The MAC layer may also use Hybrid Automatic Repeat Request (HARQ) to provide retransmission at the MAC layer to improve connection efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the mechanism, configuration, and maintenance of the RRC connection between the UE 115 and the base station 105. The RRC protocol layer can also be used to support the core network 130 of the radio bearer of the user plane data. At the physical (PHY) layer, the transport channel can be mapped to a physical channel.

The UE 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be stationary or mobile. The UE 115 may also include or be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station. , access terminal, mobile terminal, wireless terminal, remote terminal, mobile phone, user agent, mobile client, client or some other suitable term. The UE 115 can be a cellular telephone, a personal digital assistant (PDA), a wireless data modem, a wireless communication device, a handheld device, a tablet, a laptop, a wireless telephone, a wireless area loop (WLL) station, or the like. The UE may be able to communicate with different types of base stations and network devices including jumbo eNBs, small cell eNBs, relay base stations, and the like.

The communication link 125 shown in the wireless communication system 100 can include uplink (UL) transmissions from the UE 115 to the base station 105 or downlink connection (DL) transmissions from the base station 105 to the UE 115. The downlink connection transmission may also be referred to as forward link transmission, and the uplink connection transmission may be referred to as reverse link transmission. Each communication link 125 can include one or more carriers, where each carrier can be a signal (eg, a waveform signal of a different frequency) composed of a plurality of subcarriers modulated according to various radio technologies described above. Each modulated signal can be transmitted on different subcarriers and can carry control information (eg, reference signals, control channels, etc.), additional burden information, user data, and the like.

The LTE system can utilize orthogonal frequency division multiple access (OFDMA) over DL and single carrier frequency division multiple access (SC-FDMA) over UL. OFDMA and SC-FDMA partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones or bits. Each subcarrier can be modulated with the data. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may depend on the system bandwidth. For example, for a system bandwidth of 1.4, 3, 5, 10, 15, or 20 megahertz (MHz) (with a guard band), K can be equal to 72, 180, 300, 600, 900, or 1200, respectively. The carrier spacing is 15 kilohertz (KHz). The system bandwidth can also be divided into sub-bands. For example, the subband can cover 1.08MHz and can be saved. In 1, 2, 4, 8 or 16 sub-bands. The communication link 125 can transmit two-way communication using frequency division duplexing (FDD) (eg, using paired spectral resources) or time division duplex (TDD) operation (eg, using unpaired spectral resources). The frame structure can be defined for FDD (eg, frame structure type 1) and TDD (eg, frame structure type 2).

In some examples of wireless communication system 100, base station 105 or UE 115 may include multiple antennas for employing an antenna diversity scheme to improve communication quality and reliability between base station 105 and UE 115. Additionally or alternatively, base station 105 or UE 115 may employ multiple input multiple output (MIMO) technology that may utilize a multipath environment to transport multiple spatial layers carrying the same or different coded data.

The wireless communication system 100 can support operations on multiple cells or carriers, which can be referred to as carrier aggregation (CA) or multi-carrier operation. Carriers may also be referred to as CCs, layers, channels, and the like. The term "component carrier" may refer to each of a plurality of carriers utilized by a UE in carrier aggregation (CA) operation, and may be different from other portions of the system bandwidth. For example, a component carrier can be a relatively narrow bandwidth carrier that is readily or independently utilized in combination with other component carriers. Each carrier can be used to transmit control information (eg, reference signals, control channels, etc.), additional burden information, data, and the like. Multiple component carriers may be aggregated or utilized simultaneously to provide some UEs 115 with greater bandwidth and, for example, higher data rates. Each component carrier can provide the same capabilities as a separate carrier based on Release 8 or Release 9 of the LTE standard. Thus, individual component carriers may be backward compatible with legacy UE 115 (e.g., UE 115 implementing LTE Release 8 or Release 9); while other UEs 115 (e.g., UE 115 implementing the LTE release after Release 8/9) Multiple component carriers in multi-carrier mode can be configured. A carrier for DL may be referred to as a DL CC, and a carrier for UL may be referred to as a UL CC. The UE 115 may be configured with multiple DL CCs for carrier aggregation and one or more UL CCs. Additionally or alternatively, carrier aggregation can be used with TDD component carriers.

The UE 115 can communicate with a single base station 105 using multiple carriers, and can also communicate with multiple base stations simultaneously on different carriers. Each cell of the base station 105 may include a DL CC, TDD UL-DL CC or DL CC and UL CC. The coverage area 110 for each of the serving cells of the base station 105 can be different (e.g., CCs on different frequency bands can experience different path loss). In some examples, one carrier may be designated as the primary carrier or primary component carrier (PCC) for the UE 115, which may be served by the primary cell (PCell). The PCell can act as an RRC connection interface for the UE 115. Certain Uplink Control Information (UCI) (eg, acknowledgment (ACK)/NACK, Channel Quality Indicator (CQI), and scheduling information) transmitted on the Physical Uplink Control Channel (PUCCH) may be carried by the PCell. The additional carriers may be designated as secondary carriers or secondary component carriers (SCCs), which may be served by a secondary cell (SCell). The secondary cell can be configured semi-statically on a per UE basis. In some cases, the secondary cell may or may not be configured to transmit the same control information as the primary cell.

Data can be divided into logical channels, transport channels and physical layer channels. Channels can also be classified into control channels and traffic channels. The logical control channel may include a paging control channel (PCCH) for paging information, a broadcast control channel (BCCH) for broadcasting system control information, and a multicast for transmitting multimedia broadcast multicast service (MBMS) scheduling and control information. Control Channel (MCCH), Dedicated Control Channel (DCCH) for transmitting dedicated control information, Common Control Channel (CCCH) for random access information, DTCH for dedicated UE data, and multicast for multicast data Traffic Channel (MTCH). The DL transport channel may include a broadcast channel (BCH) for broadcast information, a link-to-share channel (DL-SCH) for data transfer, a paging channel (PCH) for paging information, and multicast for multicast transmission. Channel (MCH). The UL Transport Channel may include a Random Access Channel (RACH) for access and an Uplink Shared Channel (UL-SCH) for data. The DL physical channel may include a physical broadcast channel (PBCH) for broadcasting information, a physical control format indicator channel (PCFICH) for controlling format information, a physical downlink control channel (PDCCH) for controlling and scheduling information, An entity HARQ indicator channel (PHICH) for HARQ status messages, a physical downlink link shared channel (PDSCH) for user data, and a physical multicast channel (PMCH) for multicast data. UL physical channel can include access to messages The Physical Random Access Channel (PRACH), the Physical Uplink Control Channel (PUCCH) for controlling data, and the Physical Uplink Shared Channel (PUSCH) for user data.

The base station 105 can provide the measurement report configuration for the UE 115 as part of the RRC configuration. The measurement report configuration may include parameters related to neighboring cells and frequencies that the UE 115 should measure, intervals of measurement frequencies (rather than servo cells) (eg, measurement gaps), criteria for transmitting measurement reports, transmissions The interval between measurement reports and other relevant information. In some cases, the measurement report may be triggered by an event related to the channel condition of the serving cell or neighboring cell. For example, in an LTE system, the first report (A1) may be triggered when the serving cell becomes better than the threshold; the second report (A2) is triggered when the serving cell becomes worse than the threshold; The third report (A3) is triggered when the neighboring cell becomes better than the primary servo cell by a difference value; the fourth report (A4) is triggered when the neighboring cell becomes better than the threshold; the primary serving cell becomes more than The fifth report (A5) is triggered when the limit is poor and the neighboring cell is better than the other (eg, higher) threshold at the same time; the sixth is triggered when the neighboring cell becomes better than the secondary servo cell by a delta value Report (A6); triggering the seventh report (B1) when neighbors using different radio access technologies (RATs) become better than the threshold; and in the main serving cell becomes worse than the threshold and inter-RAT The eighth report (B2) is triggered when the neighbor becomes better than another threshold. In some cases, the UE 115 may wait for a timer interval called a Trigger Time (TTT) to verify that the trigger condition persists before the report is sent. Other reports may be sent periodically (e.g., the UE 115 may transmit an indication of the transport block error rate every two seconds) rather than based on the trigger condition.

The base station 105 can insert periodic pilot symbols, such as cell-specific reference signals (CRS), to assist the UE 115 in channel estimation and coherent demodulation. The CRS may include one of 504 different cell identifications. It can be modulated using quadrature phase shift keying (QPSK) and power boosted (eg, transmitted at 6 dB above ambient data elements) to make it reactive with noise and interference. Based on the number of antennas or layers (up to four) of the receiving UE 115, the CRS can be embedded in 4 to 16 resource elements in each resource block. In addition to the CRS that can be utilized by all UEs 115 in the coverage area 110 of the base station 105, the demodulation reference signal (DMRS) can also be cited. The leads are directed to a particular UE 115 and may only be transmitted on resource blocks assigned to their UEs 115. The DMRS may include transmitting signals on six of the resource elements in each of its resource blocks. In some cases, two sets of DMRSs may be transmitted in contiguous resource elements. In some cases, an additional reference signal called a Channel State Information Reference Signal (CSI-RS) may be included to assist in generating channel state information (CSI). A subset of CSI-RS resources may be designated as Interference Management Resources (IMR) and may be used for coordinated interference management between base stations, and may be referred to as Coordinated Multipoint (CoMP) operations. On the UL, the UE 115 can transmit a combination of periodic sounding reference signals (SRS) and UL DMRSs for coupling adaptation and demodulation, respectively.

The coverage area of the LTE/LTE-A network can overlap with other networks, including those using unlicensed spectrum. For example, Wi-Fi access point 150 can be connected to a device (e.g., UE 115, etc.) using a link on an unlicensed band. Other types of devices may utilize unlicensed bands for other purposes (eg, radar, etc.).

Base station 105 and UE 115 may also be configured to operate with unlicensed bands of the LTE/LTE-A carrier type, which may be referred to as Unlicensed LTE (LTE-U) operation. As described above, an agreement for unlicensed bands may require RRM technology such as DFS to allocate bandwidth and communication channels to different devices that use the band while limiting co-channel interference and adjacent channels in nearby devices sharing the unlicensed band. interference. The unlicensed band can be divided into channels assigned to a particular frequency range within the unlicensed band. For example, the 5 GHz unlicensed bands in the United States are each divided into channels of 20 MHz or 40 MHz, with additional restrictions imposed on various channels, including DFS authorized for various channels. A process that performs DFS to limit interfering co-channel interference and adjacent channel interference in nearby devices operating in an unlicensed band may be referred to as channel selection. With suitable channel selection, the LTE-U base station 105 may be able to avoid receiving/causing excessive interference with other LTE-U devices or other RATs (eg, Wi-Fi, etc.) that use the same frequency band.

To perform channel selection, base station 105 can perform interference measurements on channels within the frequency band to find suitable channels that limit co-channel and adjacent channel interference to other devices. However, pure Channel selection based on measurement may not be sufficient for optimal performance and coexistence practices. In some cases, the interference conditions at the UE served by the base station 105 can be quite different from the interference conditions seen in the interference measurements made at the base station 105. For example, a node approaching a UE served by base station 105 can cause many of the small detectable interference at base station 105, but has a greater impact on the served UE.

As described above, in current LTE/LTE-A systems, the UE 115 feeds back signal measurements to report the signal conditions of the cells served by the base station 105. For example, UE 115 typically reports RSRP or RSRQ measurements for the serving cell of base station 105. However, RSRP/RSRQ based measurements may not be suitable for channel selection in LTE-U because it requires LTE-U cells to be transmitted on the channel. Transmission on the channel for RSRP/RSRQ feedback can disrupt the interference condition for itself. For example, other nodes may retreat when sensing this transmission, and the channel may appear "clearer" than it actually is. Furthermore, measurements based on RSRP/RSRQ are only supported on the serving cell and therefore do not provide information relating to channels of the unlicensed band that the base station 105 does not currently transmit for.

In an embodiment, different aspects of the wireless communication system 100, such as the eNB 105 and the UE 115, may be configured to perform UE-assisted channel selection in an unlicensed band. The base station 105 can configure wideband interference feedback by the base station served UE 115, which can be configured for use in secondary cells in the unlicensed band. The UE may perform wideband interference measurements during a quiet period of a channel that the base station 105 is not currently transmitting (e.g., a candidate channel for channel selection, etc.) or a secondary cell of the base station 105. The UE 115 may feed back broadband interference metrics for one or more frequency channels of the unlicensed band (eg, average all received power exceeds the measured bandwidth or channel occupancy). The base station 105 can receive wideband interference feedback from the UE 115 and identify possible frequency channels for channel selection for the secondary cell based on its own measurements of the candidate channel and wideband interference feedback from the UE 115.

2 illustrates an example of a wireless communication environment 200 in accordance with various aspects of the present invention. The wireless communication environment 200 can include a base station 105-a, which can be an example of a base station 105 described herein with respect to FIG. In some examples, base station 105-a is a small cell base station. The wireless communication environment 200 can include UEs 115-a and 115-b served by a base station 105-a, which can be an example of the UE 115 described herein with respect to FIG. The wireless communication environment 200 can also include a WLAN access point 150-a that can communicate with the UEs 115-c and 115-d using a wireless connection 255. The WLAN access point 150-a and the UEs 115-c and 115-d may be part of a basic service set (BSS) 250. The BSS 250 can operate in frequency channels of unlicensed bands. The wireless communication environment 200 can include additional UEs 115 that can be served by the base station 105-a, be part of the BSS 250, or have other wireless connections.

The base station 105-a can communicate with the UEs 115-a and 115-b via the primary cell 225, which can be in the frequency band authorized to the network operator associated with the base station 105-a. To provide flexibility and efficient use of frequency resources, base station 105-a and UEs 115-a, 115-b can be configured to use unlicensed bands of LTE/LTE-A carrier waveforms (eg, LTE-U) ( For example, operating in the same frequency band used by WLAN access point 150-a. To utilize the channels of the unlicensed band, the base station 105-a may perform channel selection to assign the secondary cell 230 to one or more of the unlicensed bands.

To perform channel selection for the secondary cell 230, the base station 105-a can perform interference measurements on channels of the unlicensed band. However, the interference conditions across the wireless communication environment 200 may be inconsistent. For example, WLAN access point 150-a and UEs 115-c and 115-d may use one or more of the unlicensed bands without causing significant interference as measured by base station 105-a. Channel. If the base station 105-a selects a channel for the secondary cell 230 that is also being used by the BSS 250 for the unlicensed band, the communication between the base station 105-a and the UE 115-a or 115-b may suffer significant interference, Or transmission by the base station 105-a on the channel may force the device of the BSS 250 to retreat or reselect from the transmission to other channels, which is not an effective or desired coexistence behavior in the unlicensed band.

The base station 105-a can configure the UEs 115-a and 115-b for wideband interference feedback on frequency channels of unlicensed bands. Base station 105-a configurable UE 115-a and 115-b to base A channel that is not currently transmitted by the station 105 (e.g., a candidate channel for channel selection, etc.) or performs a wideband interference measurement during the silence period of the secondary cell 230. The UE may feedback the interference metric for the configured frequency channel of the unlicensed band (eg, average all received power exceeds the measured bandwidth). The base station 105-a may receive broadband interference feedback from the UE 115 and identify the current channel and candidate channels for the secondary cell 230 and the wideband interference feedback from the UE based on its own for the secondary cell 230. The possible frequency channel selected by the channel.

3 shows an example process flow 300 for UE-assisted channel selection in accordance with various aspects of the present invention. The process flow 300 can illustrate, for example, selecting or reselecting frequencies for unlicensed bands for secondary cells based on broadband interference measurements from UEs 115-a and 115-b in the wireless communication environment 200 of FIG. Channel processing flow. At the beginning of the process flow 300, the base station 105-a can communicate with the UEs 115-a and 115-b using the primary cell (e.g., the primary cell 225 of FIG. 2). The primary cell may use the frequency of the licensed band, such as the band licensed to the cellular network operator associated with the base station 105-a.

The base station 105-a can configure the UEs 115-a and 115-b for unlicensed bands by transmitting the broadband interference reporting configurations 305-a and 305-b to the UE 115-a and the UE 115-b, respectively. Wideband interference measurement. The broadband interference reporting configuration may include identifying one or more parameters of the measured frequency channel, timing of performing the measurements, and timing of the reporting measurements. In some cases, the broadband interference reporting configuration may include an RMTC or DRS occasion configuration. The DRS occasion configuration can include a DMTC window and indicate when the DRS will be transmitted. The RMTC and/or DRS scenario configuration can be applied to the configured secondary cell as well as any cell on the candidate frequency. In some cases, the RMTC may include a configuration for reporting the average RSSI and channel occupancy (eg, the percentage of measured samples for which the RSSI may exceed the threshold) in the reporting interval. In some examples, the broadband interference reporting configuration may include a reporting period of broadband interference feedback, filtering the measured wideband interference to obtain filtered coefficients of the filtered broadband interference, or reporting a triggering event for the broadband interference measurement.

The UEs 115-a and 115-b can perform the broadband interference measurements 310-a and 310-b, respectively. Broadband The band interference measurement 310 can include measuring the total received broadband power on each of the frequency channels, which can be measured simultaneously or measured during different (eg, interlaced, etc.) measurement windows. The measurement can be performed regardless of whether the base station 105-a can transmit during the measurement window. The UEs 115-a and 115-b may perform multiple measurements (e.g., periodically) for each of the measured frequency channels, and may perform filtering 315-a and 315-b on the measured wideband interference. Filtering may be performed using any suitable filter (e.g., an infinite impulse response (IIR) filter, a finite impulse response (FIR) filter, etc.), and filtering may be performed in accordance with filter coefficients configured by base station 105-a.

The base station 105-a may also perform a wideband interference measurement 320 on the frequency channel of the unlicensed band and may perform filtering 325 on the measured wide band interference.

UEs 115-a and 115-b may provide broadband interference feedback reports 330-a and 330-b, respectively. The broadband interference feedback report 330 can include an indicator that provides information about signal strength measurements (eg, total received broadband power) of frequency channels configured for unlicensed bands of broadband interference measurements (eg, RSSI, etc.). Although only a single wideband interference feedback report 330 from each of the UEs 115-a and 115-b is illustrated, one or more broadband interference feedback reports 330 may be provided periodically or non-periodically. For example, base station 105-a can configure UEs 115-a and 115-b to periodically feed back broadband interference reports.

Additionally or alternatively, the broadband interference feedback report 330 may be triggered by the base station 105-a aperiodically (eg, a trigger command in Downlink Control Information (DCI), etc.) or based on a report trigger. For example, the base station 105-a can configure the UEs 115-a and 115-b to have a broadband interference measurement value in the secondary cell of the base station 105-a that is less than the first threshold (U1), secondary. The broadband interference measurement value of the cell is greater than the second threshold value (U2), the broadband interference measurement value of the candidate frequency channel is smaller than the third threshold value (U4), and the broadband frequency interference measurement value of the candidate frequency channel is added. The difference is less than the broadband interference measurement (U3) of the secondary cell, the broadband interference of the secondary cell becomes higher than the threshold and the candidate channel is better than the other (eg, smaller) threshold (U5) And send a report when it is similar. In some cases, the UE 115 may wait The timer interval (eg, trigger time (TTT), etc.) is verified to verify that the trigger condition persists before the report is sent.

The base station 105-a may perform channel selection 335 based on its own measurement of frequency channels of unlicensed bands and wideband interference feedback received from the UEs 115-a and 115-b. The base station 105-a may assign one or more frequency channels to the secondary cell 230 and may configure the UEs 115-a and 115-b for operation on the secondary cell 230.

4A illustrates an example timing diagram 400-a of wideband interference measurements for channel selection in an unlicensed frequency band in accordance with various aspects of the present disclosure. Timing diagram 400-a illustrates example timing for secondary cell 230-a and wideband interference measurements for candidate channels C[1] 440-a through C[N] 440-n for UE 115. Secondary cell 230-a may be an example of secondary cell 230 of FIGS. 1 and 2. The candidate channels C[1] 440-a through C[N] 440-n may be frequency channels of unlicensed bands that are not configured as secondary cells of the UE. Candidate channels C[1] 440-a through C[N] 440-n may be, for example, base station 105 performing a channel in an unlicensed frequency band of a configured secondary cell that is currently unused or currently only used as another UE. Select the channel.

The base station 105 can configure the UE 115 for performing wideband interference measurements 310 on the secondary cell 230-a and the candidate channels C[1] 440-a through C[N] 440-n. For example, base station 105 can configure timing information indicative of wideband interference measurements for secondary cell 230-a and/or candidate channel 440 based on the DRX cycle or measurement timing configuration of UE 115. In some cases, the measurement timing configuration may include an RMTC or DRS occasion configuration for the secondary cell 230-a. The DRS occasion configuration can include a DMTC window and indicate when the DRS will be transmitted. The RMTC and DRS occasion configurations are applicable to configured secondary cells (e.g., secondary cell 230-a, etc.) and candidate channels C[1] 440-a through C[N] 440-n. For example, the RMTC of a frequency channel (eg, a configured secondary cell or candidate channel, etc.) may indicate the periodicity of the signal strength measurement period 435, the subframe offset of the signal strength measurement period 435, and/or the signal strength. The duration of the measurement period 435 (eg, multiple symbol periods, multiple sub-frames, etc.). In some cases, the RMTC may include reporting average RSSI (eg, filter parameters, etc.) and channel occupancy during the reporting interval Configuration information (for example, the RSSI can exceed the percentage of the measured sample of the signal strength measurement period of the configured threshold).

In some cases, base station 105 suppresses transmission 425 during signal strength measurement period 435-a of secondary cell 230-a (e.g., does not transmit on any frequency resources within the frequency channel assigned to secondary cell 230-a) ). Regardless of whether base station 105 inhibits transmission during signal strength measurement period 435-a or continues transmission to UE 115 or other UE 115, UE 115 may be at the frequency of secondary cell 230-a during signal strength measurement period 435-a. Wideband measurements 310 (eg, received signal strength measurements, etc.) are performed on the channel for interference reporting.

As shown in FIG. 4A, it may also be used for the signal strength measurement period 435-b for the wideband measurement on the candidate channel C[1] 440-a and for the candidate channel C[N] 440-n. The signal strength measurement period 435-c of the broadband measurement configures the UE 115. The configuration for the signal strength measurement period on the candidate channel 440 may include an RMTC or DRS occasion configuration. As depicted in FIG. 4A, different frequencies (eg, secondary cells or candidate channels) may be configured for UEs 115 having independent measurement timing configurations with different signal strength measurement periods 435. Although not configured for the UE 115 of the measurement timing configuration illustrated in Figure 4A, the candidate frequencies C[1] 440-a through C[N] 440-n may be configured for other UEs 115 Level cell. The base station 105 can suppress all of the candidate frequencies C[1] 440-a through C[N] 440-n on the cells configured for the other UEs during the respective signal strength measurement period 435 (eg, all of the channels) Transmission on the frequency resources such that the UE 115 and/or other UEs 115 can provide interference feedback for the channel.

The UE 115 may perform the broadband measurement 310 during the configured signal strength measurement period 435 of the configured measurement target. Wideband metrology 310 may include measuring total received broadband power and may include co-channel interference, interference from transmissions on adjacent channels, and other interference (eg, thermal noise, etc.). The UE 115 may filter the wideband measurements 310 and provide broadband interference feedback (eg, RSSI, etc.) based on the filtered broadband interference measurements 310 to the base station 105.

Additionally or alternatively, the measurement timing configuration for the UE 115 may provide a set of resource elements for wideband interference measurements. 4B illustrates an example timing diagram 400-b of wideband interference measurements for channel selection in an unlicensed band in accordance with various aspects of the present invention. Timing diagram 400-b illustrates an example timing for wideband interference measurements for secondary cell 230-b. Secondary cell 230-b may be an example of secondary cell 230 of FIG. 1, FIG. 2, or FIG. 4A.

The base station 105 can transmit over the secondary cell 230-b on the frequency channel of the unlicensed band using the LTE/LTE-A carrier waveform 455. The LTE/LTE-A carrier waveform 455 can include frequency and time resources that can be allocated in the resource block 460. Resource block 460 may include resources allocated to physical channels (eg, PDCCH, PDSCH, etc.) and reference signals (eg, CRS, CSI-RS, IMR, etc.). The physical channel may also include additional reference signals (eg, UE-RS). The base station 105 can suppress transmissions on resources allocated to carrier waveforms 455 of broadband interference measurements (e.g., Wideband Interference Reference Signals (WBI-RS)). In some cases, WBI-RS resources 465 may be part of a resource allocated (eg, assigned to a particular antenna, etc.) for a CSI-RS, IMR, or UE-RS. In some examples, WBI-RS resource 465 can include each subcarrier that spans one or more symbols of the bandwidth of secondary cell 230-b for a particular subframe. In some examples, base station 105 may inhibit transmissions on WBI-RS resources 465 only during configured signal strength measurement periods (eg, configured according to periodicity, subframe offset, duration, etc.).

FIG. 5 illustrates an example of a timing diagram 500 for reporting broadband interference feedback in accordance with various aspects of the present disclosure. Timing diagram 500 may illustrate, for example, wideband interference feedback reporting a secondary cell or one or more candidate frequency channels based on a configured measurement target as discussed above.

In timing diagram 500, base station 105 can configure UE 115 to report wideband interference feedback for secondary cells and candidate frequency channels based on reporting triggers. Secondary cell interference 530 may represent filtered wideband received signal strength at UE 115 for the secondary cell, and candidate frequency interference 540 may represent filtered wideband received signal strength at UE 115 for the candidate frequency channel.

In the secondary cell 530 becomes greater than the interference threshold value T _S 550 may trigger the first reporting (e.g., U2 event) 510. The second report 555 (eg, a U4 event) may be triggered when the candidate frequency interference 540 becomes less than the threshold T _C 515. The third report 560 (eg, a U3 event) may be triggered when the candidate frequency interference 540 plus the difference 520 becomes less than the secondary cell interference 530. Timing diagram 500 depicts only the timing of some trigger events, and as described above, other events may trigger additional reporting.

6 shows a block diagram of a wireless device 600 configured in accordance with various aspects of the present invention to provide wideband interference feedback for channel selection in an unlicensed frequency band. Wireless device 600 may be an example of the aspect of UE 115 described with reference to Figures 1-5. Wireless device 600 can include a receiver 605, a broadband interference manager 610, or a transmitter 615. Wireless device 600 can also include a processor. Each of these components can communicate with each other.

Receiver 605 can receive information such as packets, user profiles, or control information associated with various information channels (eg, control channels, data channels, and information related to LTE-U RRM based on silence interference measurements, etc.). Information 620 can be passed to broadband interference manager 610 and passed to other components of wireless device 600. For example, information 720 can include received signal transmission or detected power received via one or more channels (eg, secondary cells, candidate frequency channels, etc.).

The broadband interference manager 610 can identify a configuration for reporting and reporting broadband interference of one or more frequency channels of the unlicensed band to the base station, performing broadband interference measurements on the one or more frequency channels Filtering the broadband interference measurement to obtain filtered wideband interference for the one or more frequency channels and reporting the filtered broadband interference to the base station.

Transmitter 615 can transmit signals 625 received from other components of wireless device 600. In some examples, transmitter 615 can be co-located with receiver 605 in the transceiver. Transmitter 615 can include a single antenna, or it can include a plurality of antennas.

7 shows a block diagram of a wireless device 700 that provides wideband interference feedback for channel selection in an unlicensed band in accordance with various aspects of the present invention. Wireless device 700 can be an example of the aspect of wireless device 600 or UE 115 described with reference to Figures 1-6. Wireless device 700 can include a receiver 605-a, a broadband interference manager 610-a, or a transmitter 615-a. Wireless device 700 can also include a processor. Each of these components can communicate with each other. The broadband interference manager 610-a may also include a broadband interference feedback configuration manager 705, a broadband interference measurement manager 710, a broadband interference filter 715, and a broadband interference reporter 720.

Receiver 605-a may receive signals and interference via one or more channels (eg, secondary cells, candidate frequency channels, etc.) and pass information 620-a to broadband interference manager 610-a and to device 700. Other components. The broadband interference manager 610-a may perform the operations described herein with reference to FIG. Transmitter 615-a can transmit signal 625-a received from other components of wireless device 700.

The wideband interference feedback configuration manager 705 can identify a measurement timing configuration indicative of a signal strength measurement period of one or more frequency channels of the unlicensed band as described herein with reference to Figures 2-5. For example, the measurement timing configuration can include measuring and reporting one or more measurement targets (eg, frequency channels, timing parameters, etc.) of the broadband interference of the channels of the unlicensed band.

In some examples, the configuration includes timing information indicative of a signal strength measurement period for which the base station suppresses transmissions on the one or more frequency channels of the serving cell. The wideband interference feedback configuration manager 705 can send the measurement timing information 725 to the broadband interference measurement manager 710. The measurement timing information 725 can include, for example, a time period in which the received signal strength measurements are performed on the secondary cells or candidate channels as described above with reference to Figures 1 through 6.

The broadband interference measurement manager 710 can perform wideband interference measurements on one or more frequency channels as described herein with reference to Figures 2-5. In some examples, performing broadband interference measurement on one or more frequency channels includes measuring interference measurement resources of a serving cell of one or more frequency channels, and channel state information reference signals suppressed by the base station for the serving cell ( CSI-RS) resource, total power received across the bandwidth of the serving cell used for the signal strength measurement period associated with the serving cell or unlicensed for communication not currently used by the base station One or more of the total power received by the bandwidth of the candidate frequency channel of the weight band. The broadband interference measurement manager 710 can transmit the interference measurement 730 to the broadband interference filter 735.

The wideband interference filter 715 can filter the wideband interference measurements to obtain filtered broadband interference for one or more frequency channels, as described herein with respect to Figures 2-5. The broadband interference filter 715 can transmit the filtered measurement 735 to the broadband interference reporter 720.

The wideband interference reporter 720 can report the filtered wideband interference to the base station as described herein with reference to Figures 2-5. The reporting can be performed periodically, based on triggering events from the base station, aperiodically or based on trigger events configured by the base station. For example, the triggering event for reporting the filtered broadband interference to the base station may include that the broadband interference measurement value of the serving cell of the base station is greater than the first threshold, and the broadband interference measurement value of the serving cell is less than The second threshold, the broadband interference measurement value of the candidate frequency channel that is not currently used by the base station for communication, is smaller than the third threshold or the broadband interference measurement value of the candidate frequency channel plus one difference The amount is smaller than the wideband interference measurement value of the servo cell.

8 shows a block diagram 800 of a broadband interference manager 610-b that provides wideband interference feedback for channel selection in an unlicensed band in accordance with various aspects of the present invention. The broadband interference manager 610-b may be an example of the aspect of the broadband interference manager 610 described with reference to Figures 6-7. The broadband interference manager 610-b may include a broadband interference feedback configuration manager 705-a, a broadband interference measurement manager 710-a, a broadband interference filter 715-a, and a broadband interference reporter 720-a. . Each of these elements can perform the functions described above with reference to FIG. The broadband interference feedback configuration manager 705-a may include a DRX configuration 805, a DRS occasion configuration 810, an RSSI measurement timing configuration 815, and a broadband interference measurement timer 820. The DRX configuration 805 can include one or more parameters related to the DRX operation of the UE 115. The DRS scenario configuration 810 can include DRS information and DMTC parameters for one or more secondary cells. The RSSI measurement timing configuration may include one or more parameter sets indicating signal strength measurement periods of one or more frequency channels (eg, configured secondary cells or candidate frequency channels, etc.).

The broadband interference measurement timer 820 can identify the measurement time period of one or more frequency channels based at least in part on the DRX configuration 805, the DRS occasion configuration 810, and/or the RSSI measurement timing configuration 815. For example, the measurement time period of a given candidate frequency channel can be identified based on the RSSI measurement timing configuration of the channel and the ON duration of the DRX cycle. The wideband interference feedback configuration manager can transmit timing information 725-a including the measurement time period to the wideband interference measurement manager 710.

Moreover, as described with reference to FIG. 7, the broadband interference measurement manager 710-a can transmit the interference measurement 730-a to the broadband interference filter 715-a. The wideband interference filter 715-a may send the filtered measurement 735-a to the wideband interference reporter 720-a.

The components of devices 600 and 700 (including broadband interference manager 610 of Figures 6, 7, and 8) may be used individually or collectively with at least one ASIC adapted to perform some or all of the applicable functions in hardware. Implementation. Alternatively, the functions may be performed by one or more other processing units (or cores) on at least one IC. In other examples, other types of integrated circuits (eg, structured/platform ASICs, FPGAs, or another semi-custom IC) may be used, which may be programmed in any manner known in the art. The functionality of each unit may also be implemented in whole or in part by instructions embodied in memory that are executed by one or more general purpose or special application processors.

9 shows a diagram of a system 900 including a UE 115 configured to provide wideband interference feedback for channel selection in an unlicensed band, in accordance with various aspects of the present invention. System 900 can include a UE 115-e, which can be an example of wireless device 600, wireless device 700, or UE 115 described herein with reference to Figures 1, 2, 3, and 6-8. The UE 115-e may include a broadband interference manager 910, which may be an example of the broadband interference manager 610 described with reference to Figures 6-8. The UE 115-e may also include components for two-way voice and data communication, the components including components for transmitting communications and components for receiving communications. For example, UE 115-e can communicate bi-directionally with base station 105-b or UE 115-f.

The UE 115-e may also include a processor 905 and a memory 915 (including a software (SW) 920), a transceiver 935, and one or more antennas 940, each of which may communicate directly or indirectly with each other ( For example, via bus 945). As described above, the transceiver 935 can communicate bi-directionally with one or more networks via an antenna 940 or a wired or wireless connection. For example, transceiver 935 can be in two-way communication with base station 105 or another UE 115. The transceiver 935 can include a data machine for modulating the packet and providing the modulated packet to the antenna 940 for transmission and for demodulating the packet received from the antenna 940. Although the UE 115-e may include a single antenna 940, the UE 115-e may also have multiple antennas 940 capable of simultaneously transmitting or receiving multiple wireless transmissions.

Memory 915 can include random access memory (RAM) and read only memory (ROM). Memory 915 can store computer readable, computer executable software/firmware code 920, including instructions that, when executed, cause processor 905 to perform various functions described herein (eg, for unauthorized use) Broadband interference feedback for channel selection in the frequency band, etc.). Alternatively, the software/firmware code 920 may not be directly executable by the processor 905, but rather cause the computer (e.g., when compiled and executed) to perform the functions described herein. Processor 905 can include smart hardware devices (eg, central processing units (CPUs), microcontrollers, ASICs, etc.).

10 shows a block diagram of a wireless device 1000 configured to perform channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. Wireless device 1000 can be an example of the aspect of base station 105 described with reference to Figures 1-9. The wireless device 1000 can include a receiver 1005, a base station broadband interference manager 1010, or a transmitter 1015. Wireless device 1000 can also include a processor. Each of these components can communicate with each other.

Receiver 1005 can receive information, such as packets, user profiles, or control information associated with various information channels (eg, control channels, data channels, and information related to broadband interference measurements, etc.). The receiver 1005 can transmit the information 1020 to the base station broadband The interference manager 1010 is coupled to other components of the wireless device 1000. In some examples, receiver 1005 can receive UE wideband interference information reported by UEs served by base station 105.

The base station broadband interference manager 1010 can configure the served UE to report the broadband signal strength of one or more frequency channels of the unlicensed band, and receive the UE wideband interference feedback from the UE by measuring one or more frequencies. The channel interference determines the base station broadband interference information, and the frequency channel for the secondary cell of the base station is identified based at least in part on the base station broadband interference information and the received UE broadband interference information.

Transmitter 1015 can transmit signal 1025 received from other components of wireless device 1000. In some examples, transmitter 1015 can be co-located with receiver 1005 in the transceiver. Transmitter 1015 can comprise a single antenna, or it can include a plurality of antennas. In some examples, transmitter 1015 can suppress transmissions on the secondary cell for the signal strength measurement period.

11 shows a block diagram of a wireless device 1100 for performing channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. Wireless device 1100 can be an example of the aspect of wireless device 1000 or base station 105 described with reference to Figures 1-10. The wireless device 1100 can include a receiver 1005-a, a base station broadband interference manager 1010-a, or a transmitter 1015-a. The wireless device 1100 can also include a processor. Each of these components can communicate with each other. The base station broadband interference manager 1010-a may also include a channel selection feedback configuration manager 1105, a cell suppression manager 1120, a channel selection measurement manager 1130, and a channel selection manager 1140.

The components of the wireless device 1100 can be implemented individually or collectively with at least one ASIC adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on at least one IC. In other examples, other types of integrated circuits (eg, structured/platform ASICs, FPGAs, or another semi-custom IC) may be used, which may be programmed in any manner known in the art. Alternatively, in whole or in part, by being embodied in memory, by one or more general Or the instructions executed by the special application processor to implement the functions of each unit.

Receiver 1005-a can receive information, such as packets, user profiles, or control information. Receiver 1005-a can communicate information 1020-a to base station broadband interference manager 1010-a and to other components of base station 105. The base station broadband interference manager 1010-a may perform the operations described herein with reference to FIG. Transmitter 1015-a can transmit signal 1025-a received from other components of wireless device 1100.

The channel selection feedback configuration manager 1105 can configure the UE 115 for reporting broadband signal strength for one or more frequency channels of the unlicensed band, as described herein with respect to Figures 2-5. In some examples, configuring the UE may include configuration information indicating a signal strength measurement period of a frequency channel (eg, a serving cell or a candidate channel) indicating one or more frequency channels (eg, DRS occasion configuration, RMTC, etc.) And identifying a frequency information of a candidate frequency channel of the unlicensed band, a broadband interference reporting period, filtering the measured wideband interference to obtain a filter coefficient of the filtered broadband interference, a channel occupancy threshold, or a combination thereof Send to the UE. In some examples, the one or more frequency channels include at least one candidate frequency channel of an unlicensed frequency band that is not currently being used by the base station for communication. The channel selection feedback configuration manager 1105 can send configuration information 1110 (e.g., via transmitter 1015-a) to the UE 115. The channel selection feedback configuration manager 1105 can transmit the signal strength measurement period information 1115 to the cell suppression manager 1120.

The cell suppression manager 1120 can suppress the serving cell for the configured signal strength measurement period. The cell suppression manager 1120 may suppress the transmitter 1015-a based on the signal strength measurement period information 1115, which may indicate the allocated resources (e.g., any number of serving cells) to be suppressed by the base station. The signal strength measurement period information 1115 can be based on, for example, a DRS occasion configuration or RMTC.

Channel selection measurement manager 1130 can determine base station broadband interference information by measuring signal strength of one or more frequency channels (e.g., via receiver 1005-a), as described herein with respect to Figures 2-5. . Channel selection measurement manager 1130 may additionally receive (eg, The UE broadband received signal strength information 1125 is measured by the UE 115 via the receiver 1005-a based on the timing information 1110 sent to the UE 115. The channel selection measurement manager 1130 may aggregate the interference information of the frequency channel of the unlicensed band (including the base station broadband interference information and the UE broadband received signal strength information 1125), and send the aggregated interference information 1135 to the channel selection manager 1140. .

The channel selection manager 1140 may perform channel selection on the frequency channel of the unlicensed band based on the aggregated interference information 1135. For example, the channel selection manager 1140 can identify frequency channels for the secondary cells of the base station based at least in part on the base station broadband interference information and the received UE wideband received signal strength information 1125, as described herein with reference to FIG. Figure 5 depicts. In some examples, the primary cell of the base station serves a plurality of UEs, and identifying the frequency channel for the secondary cell can include determining the lowest combined interference based at least in part on the base station broadband interference information and the received UE broadband interference information The frequency channel of the level or the strongest signal strength information.

12 shows a block diagram 1200 of a base station wideband interference manager 1010-b for performing channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. The base station broadband interference manager 1010-b may be an example of the aspect of the base station broadband interference manager 1010 described with reference to Figures 10-11. The base station broadband interference manager 1010-b may include a channel selection feedback configuration manager 1105-a, a cell suppression manager 1120-a, a channel selection measurement manager 1130-a, and a channel selection manager 1140-a. Each of these elements can perform the functions described herein with reference to FIG. The base station broadband interference manager 1010-b may also include a channel selection measurement timer 1205 and a configuration selection manager 1215.

The channel selection measurement timer 1205 can identify the resources of the base station 105 to be suppressed for signal strength measurement. For example, the channel selection measurement timer 1205 can determine the schedule of the signal strength measurement period for the serving cell of the base station 105. The channel selection measurement timer 1205 can send the measurement timing information 1210 to the configuration selection manager 1215.

The configuration selection manager 1215 can indicate the indication signal strength measurement period (the base station is targeted to the The configuration information 1110-a of the equal signal strength measurement period suppressing transmissions on the servo cell or one or more frequency channels is transmitted to at least one UE, as described herein with reference to Figures 2-5. The configuration information 1110-a may be based on the measured timing information 1210 received from the channel selection measurement timer 1205. In some examples, the timing information 1110-a may include a DRX cycle of at least one UE, a measurement timing configuration (such as RMTC) indicating a timing of a signal strength measurement period of the serving cell, or a DRS occasion configuration of the serving cell. One or more. The DRS occasion configuration can include a DMTC window and indicate when the DRS will be transmitted. The RMTC and DRS occasion configuration can be identified by the configured secondary cell and any candidate frequencies. In some cases, the RMTC may include a configuration for reporting the average RSSI and channel occupancy (eg, the percentage of measured samples for which the RSSI may exceed the threshold) at reporting intervals. As described above, the channel selection feedback configuration manager 1105-a can compile the configuration information 1110-a and transmit the signal strength measurement period information 1115-a to the cell suppression manager 1120-a.

The cell suppression manager 1120-a may suppress any of the serving cells of the base station 105 during the corresponding signal strength measurement period, as described with reference to Figures 10-11. The cell suppression manager 1120-a may suppress the frequency based on the signal strength measurement period information 1115-a.

Channel selection measurement manager 1130-a may receive (e.g., via receiver 1005) UE wideband received signal strength information 1125-a to determine base station broadband interference information, as described herein with respect to Figures 10-11. Channel selection measurement manager 1130-a may send aggregated interference information 1135-a to channel selection manager 1140-a. Channel selection manager 1140-a may perform channel selection on frequency channels of unlicensed bands (e.g., select which channels are used as secondary cells for the served UE), as described herein with reference to Figures 10-11.

The configurations of devices 1000 and 1100, including base station broadband interference manager 1010 of Figures 10, 11, and 12, may be used individually or collectively with at least one of some or all of the applicable functions suitable for performing in hardware. ASIC to implement. Alternatively, the functions may be performed by one or more other processing units (or cores) on at least one IC. In other examples, other types of integrated circuits may be used (eg, structured/platform ASIC, FPGA, or another Semi-custom IC), which can be programmed in any manner known in the art. The functionality of each unit may also be implemented in whole or in part by instructions embodied in memory that are executed by one or more general purpose or special application processors.

13 shows a diagram of a system 1300 including a base station 105-c configured to perform channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. The base station 105-c can be an example of the wireless device 1000, the wireless device 1100, or the base station 105 described herein with reference to Figures 1, 2, 3, and 10 through 12. The base station 105-c may include a base station broadband interference manager 1310, which may be an example of a base station broadband interference manager 1010 described with reference to Figures 10-12. The base station 105-c may also include components for two-way voice and data communication, the components including components for transmitting communications and components for receiving communications. For example, base station 105-c can communicate bi-directionally with UEs 115-g and 115-h.

In some cases, base station 105-c may have one or more wired no-load transmission links. Base station 105-c may have a wired no-load transmission link (e.g., an S1 interface, etc.) to core network 130-a. The base station 105-c can also communicate with other base stations 105 (such as the base station 105-m and the base station 105-n) via an inter-base station airborne transport link (e.g., an X2 interface). Each of the base stations 105 can communicate with the UE 115 using the same or different wireless communication technologies. In some cases, base station 105-c can utilize base station communication manager 1325 to communicate with other base stations, such as base station 105-m or 105-n. In some examples, the base station communication manager 1325 can provide an X2 interface within the LTE/LTE-A wireless communication network technology to provide communication between some of the base stations 105. In some examples, base station 105-c can communicate with other base stations via core network 130-a. In some cases, base station 105-c can communicate with core network 130-a via network communication manager 1330.

The base station 105-c can include a processor 1305, a memory 1315 (including a software (SW) 1320), a transceiver 1335, and an antenna 1340, each of which can communicate directly or indirectly with each other (eg, via a busbar system 1345). . The transceiver 1335 can be configured to communicate bi-directionally with the UE 115, which can be a multi-mode device, via the antenna 1340. Transceiver 1335 (or base station Other components of 105-c) may also be configured to communicate bi-directionally with one or more other base stations (not shown) via antenna 1340. The transceiver 1335 can include a data machine configured to modulate the packet and provide the modulated packet to the antenna 1340 for transmission and configured to demodulate the packet received from the antenna 1340. The base station 105-c can include a plurality of transceivers 1335, each having one or more associated antennas 1340. The transceiver can be an example of the combined receiver 1005 and transmitter 1015 of FIG.

The memory 1315 may include a RAM and a ROM. The memory 1315 can also store computer-readable, computer-executable software code 1320 containing instructions that are configured to cause the processor 1310 to perform various functions described herein (eg, to perform unauthorized operations) when executed. Channel selection, job phase processing, database management, message routing, etc. in the frequency band). Alternatively, software 1320 may not be directly executable by processor 1305, but rather configured to cause (eg, when compiled and executed) a computer to perform the functions described herein. The processor 1305 can include smart hardware devices such as a CPU, a microcontroller, an ASIC, and the like. The processor 1305 can include various specialized processors such as an encoder, a queue processing configuration, a baseband processor, a radio headend controller, a digital signal processor (DSP), and the like.

The base station communication manager 1325 can manage communications with other base stations 105. The communications manager can include a controller or scheduler for cooperating with other base stations 105 to control communications with the UE 115. For example, base station communication manager 1325 can coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission.

14 shows a flow diagram of a method 1400 of providing wideband interference feedback for channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. The operation of method 1400 can be performed by UE 115 or components thereof as described with reference to Figures 1-13. For example, the operations of method 1400 can be performed by wideband interference manager 610 as described with reference to Figures 6-9. In some examples, UE 115 may execute a set of code to control the functional elements of UE 115 to perform the functions described below. Additionally or alternatively, the UE 115 may use specialized hardware to perform the functions described below.

At block 1405, the UE 115 can identify the broadband interference reporting configuration as described herein with respect to Figures 2-5. In some cases, the configuration includes timing information of frequency channels (eg, secondary cells, candidate channels, etc.) and timing information indicating a signal strength measurement period, and the base station suppresses transmission on the frequency channel for the signal strength measurement period . The timing information may include one or more of a DRX cycle of the UE, a measurement timing configuration (eg, RMTC) indicating a timing of the signal strength measurement period, or a DRS occasion configuration of the cell, as described herein with reference to FIGS. 2-5. Described. The DRS occasion configuration can include a DMTC window and indicate when the DRS will be transmitted. Each RMTC and/or DRS occasion configuration can be associated with a configured secondary cell or candidate frequency. In some cases, the RMTC may include a configuration for reporting the average RSSI and channel occupancy (eg, the percentage of measured samples for which the RSSI may exceed the threshold) at reporting intervals. For example, when providing RMTC for a secondary cell, UE 115 may assume that the base station is not transmitting on any of the resources of the cell during the signal strength measurement period configured by RMTC. In addition to or in lieu of the signal strength measurement period, the UE 115 may determine resources (eg, one or more resource elements or symbol periods) that are allocated for interference measurement based on timing information (eg, as described with reference to FIG. 4B). The broadband interference reporting configuration may also include information for filtering or reporting the strength of the broadband signal (eg, filter parameters, periodic reporting intervals, etc.). In some examples, operation of block 1405 can be performed by wideband interference feedback configuration manager 705 as described herein with reference to FIG.

At block 1410, the UE 115 can determine signal strength measurement resources for one or more frequency channels based at least in part on the timing information. For example, the UE 115 may determine that the amount of broadband signal strength may be performed on a frequency channel during one or more time intervals (eg, symbol periods, subframes, etc.) of the signal strength measurement period configured by the RMTC. Measurement. In some examples, operation of block 1410 may be performed by wideband interference timer 805 as described herein with reference to FIG.

At block 1415, the UE 115 may perform wideband signal strength measurements on one or more frequency channels, as described herein with respect to Figures 2-5. In some examples, block 1415 Operation may be performed by the wideband interference measurement manager 710 as described herein with reference to FIG.

At block 1420, the UE 115 may filter the wideband signal strength measurements as described herein with respect to Figures 2-5. Filtering can be performed based on parameters received in the broadband interference reporting configuration. In some examples, operation of block 1420 can be performed by wideband interference filter 715 as described herein with reference to FIG.

At block 1425, the UE 115 may report the filtered wideband interference to the base station 105 as described herein with respect to Figures 2-5. In some examples, the operation of block 1425 can be performed by wideband interference reporter 720 as described herein with reference to FIG.

15 shows a flow diagram of a method 1500 of providing wideband interference feedback for channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. The operation of method 1500 can be performed by UE 115 or its configuration as described with reference to Figures 1 through 13. For example, the operations of method 1500 can be performed by wideband interference manager 610 as described with reference to Figures 6-9. In some examples, UE 115 may execute a set of code to control the functional elements of UE 115 to perform the functions described below. Additionally or alternatively, the UE 115 may use specialized hardware to perform the functions described below. Method 1500 can also incorporate aspects of method 1400 of FIG.

At block 1505, the UE 115 can identify the broadband interference reporting configuration as described herein with respect to blocks 1405 of FIGS. 2-5 and 14. In some embodiments, the broadband interference reporting configuration may include a triggering event for reporting the broadband signal strength of the frequency channel of the unlicensed band. In some examples, operation of block 1505 may be performed by wideband interference feedback configuration manager 705 as described herein with reference to FIG.

At block 1510, the UE 115 may perform wideband signal strength measurements on one or more frequency channels, as described herein with respect to blocks 1410 and 1415 of FIGS. 2-5 and 14. In some examples, operation of block 1510 can be performed by wideband interference measurement manager 710 as described herein with reference to FIG.

At block 1515, the UE 115 can filter the broadband interference signal strength to obtain one or The filtered wideband signal strength for multiple frequency channels is as described herein with respect to block 1420 of Figures 2-5 and 14. In some examples, operation of block 1515 may be performed by wideband interference filter 715 as described herein with reference to FIG.

At block 1520, the UE 115 may identify a reporting event that triggers reporting of filtered wideband interference to the base station 105, as described herein with respect to Figures 2-5. In some cases, the measured value of the broadband signal strength of the serving cell of the base station 105 is greater than the first threshold, and the measured value of the broadband signal strength of the serving cell is less than the second threshold, which is not currently used by the base station 105. The broadband signal strength measurement value of the candidate frequency channel for the unlicensed band of communication is smaller than the third threshold value or the broadband signal strength measurement value of the candidate frequency channel plus a difference smaller than the wideband signal strength of the serving cell The measured value triggers the reporting of the broadband signal strength. In some examples, operation of block 1520 can be performed by wideband signal strength feedback configuration manager 705 as described herein with reference to FIG.

If a trigger event is detected at block 1520, then at block 1525 the UE 115 can report the filtered wideband signal strength to the base station. If no trigger event is detected at block 1520, UE 115 may continue to perform the wideband signal strength measurement at block 1510. In some examples, the operation of block 1525 can be performed by wideband interference reporter 720 as described herein with reference to FIG.

16 shows a flow diagram of a method 1600 for performing channel selection in an unlicensed frequency band in accordance with various aspects of the present invention. The operation of method 1600 can be performed by base station 105 or components thereof as described with reference to Figures 1-13. For example, the operations of method 1600 can be performed by base station broadband interference manager 1010 as described with reference to Figures 10-13. In some examples, base station 105 can execute a set of code to control the functional elements of base station 105 to perform the functions described below. Additionally or alternatively, the base station 105 can use specialized hardware to perform the functions described below.

At block 1605, the base station 105 can configure the served UE 115 for reporting broadband interference for one or more frequency channels of the unlicensed band, as described herein with respect to Figures 2-5. Said. For example, the base station 105 can transmit timing information indicating the signal strength measurement period (the base station 105 suppresses transmission on the serving cell of the one or more frequency channels for the signal strength measurement period) to the served UE 115. As described herein with reference to Figures 2 to 5. In some examples, operation of block 1605 may be performed by channel selection feedback configuration manager 1105, as described herein with respect to FIG. 11 or FIG.

At block 1610, the base station 105 can suppress transmissions on the serving cell for the signal strength measurement period, as described herein with respect to Figures 2-5. In some cases, base station 105 can suppress any number of serving cells for a corresponding signal strength measurement period. In some examples, operation of block 1610 may be performed by cell suppression manager 1120 as described herein with reference to FIG.

At block 1615, the base station 105 can receive UE wideband signal strength information reported by at least one UE, as described herein with respect to Figures 2-5. The UE wideband signal strength information may include an indicator of the signal strength of the serving cell and/or the candidate frequency channel (eg, RSS1). In some examples, the operation of block 1615 can be performed by receiver 1005 as described herein with reference to FIG.

At block 1620, base station 105 can determine base station wideband signal strength information by measuring the signal strength of one or more frequency channels, as described herein with respect to Figures 2-5. In some examples, the operation of block 1620 can be performed by channel selection measurement manager 1130 as described herein with reference to FIG.

At block 1625, the base station 105 can select a frequency channel for the secondary cell of the base station 105 based at least in part on the base station broadband signal strength information and the received UE wideband signal strength information, as described herein with reference to FIG. Figure 5 depicts. In some examples, the operation of block 1625 can be performed by channel selection manager 1140 as described herein with reference to FIG.

Thus, methods 1400, 1500, and 1600 can provide UE-assisted channel selection in an unlicensed band. It should be noted that the methods 1400, 1500, and 1600 describe possible implementations, and that the operations and steps may be reconfigured or otherwise modified to make other implementations possible. In a In some examples, aspects of two or more of methods 1400, 1500, and 1600 can be combined.

The detailed description set forth above with reference to the accompanying drawings, FIG. The term "exemplary" is used throughout the specification to mean "serving as an example, instance or description" and does not mean "better" or "favorable" relative to other examples. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, such techniques may be practiced without such specific details. In some instances, well-known structures and devices are shown in the form of block diagrams in order to avoid obscuring the concept of the described examples.

Information and signals can be represented using any of a variety of different techniques and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and wafers that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields, or optical particles, or any combination thereof.

The various illustrative blocks and configurations described in connection with the present invention herein can be used with general purpose processors, DSPs, ASICs, FPGAs or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or designed It is implemented or executed in any combination of the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented as a combination of computing devices (eg, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or code on a computer readable medium or transmitted through a computer readable medium. Other examples and implementations are within the scope of the invention and the scope of the appended claims. For example, due to the nature of the software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwire, or a combination of any of these. Implementation function The features may also be physically located at various locations, including being distributed such that portions of the functionality are implemented at different physical locations. Also, as used herein, included in the scope of the patent application, the "or" used in the list of items (for example, a list of items such as "at least one of" or "one or more of") The indication includes an inclusive list such that, for example, the list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC (ie, A and B and C).

Computer-readable media includes both non-transitory computer storage media and communication media, including any media that facilitates the transfer of a computer program from one location to another. The non-transitory storage medium can be any available media that can be accessed by a general purpose or special purpose computer. By way of example and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable read only memory (EEPROM), compact disk (CD) ROM or other optical disk storage, disk storage Or other magnetic storage device, or any other non-transitory medium that can be used to carry or store the desired code component in the form of an instruction or data structure and that can be accessed by a general purpose or special purpose computer or a general purpose or special purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair cable, digital subscriber line (DSL), or wireless technology such as infrared, radio, and microwave is used to transmit software from a website, server, or other remote source, the coaxial cable Wire, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of the media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital versatile discs (DVDs), flexible discs, and Blu-ray discs, where the discs are typically magnetically regenerated and the discs are laserd. Optically regenerate data. Combinations of the above are also included in the context of computer readable media.

The previous description of the present invention is provided to enable a person skilled in the art to make or use the invention. Various modifications of the invention will be apparent to those skilled in the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Thus, the present invention is not intended to be limited to the examples described herein and The design should conform to the broadest scope consistent with the principles and novel features disclosed herein.

The techniques described herein are applicable to a variety of wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), OFDMA, SC-FDMA, and others. The terms "system" and "network" are often used interchangeably. A CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and the like. CDMA2000 covers the IS-2000, IS-95 and IS-856 standards. IS-2000 version 0 and IS-2000 version A are commonly referred to as CDMA2000 1X, 1X, and the like. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), and the like. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system can implement a radio technology such as the Global System for Mobile Communications (GSM). The OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and the like. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and Advanced LTE (LTE-A) are new releases of the Universal Mobile Telecommunications System (UMTS) using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and Global System for Mobile Communications (GSM) are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used in the systems and radio technologies mentioned above, as well as in other systems and radio technologies. However, the above description describes the LTE system for purposes of example, and the LTE terminology is used in the extensive description above, but the techniques are also applicable outside of LTE applications.

105-a‧‧‧ base station

115-a‧‧‧User equipment

115-b‧‧‧User equipment

230‧‧‧Secondary community

300‧‧‧ Process flow

305-a‧‧‧Broadband Interference Reporting Configuration

305-b‧‧‧Broadband Interference Reporting Configuration

310-a‧‧‧Broadband interference measurement

310-b‧‧‧Broadband interference measurement

315-a‧‧‧Filter

315-b‧‧‧Filter

320‧‧‧Broadband interference measurement

325‧‧‧ Filter

330-a‧‧‧Broadband Interference Feedback Report

330-b‧‧‧Broadband Interference Feedback Report

335‧‧‧ channel selection

Claims (29)

A method of wireless communication, comprising: identifying, at a user equipment (UE), a measurement value to be used for channel selection assistance to a configuration of a base station, wherein the configuration includes an indication of at least one frequency channel Individual timing information of a plurality of signal strength measurement periods of the at least one frequency channel; performing broadband measurement on the at least one frequency channel during the plurality of signal strength measurement periods; filtering the wideband measurement to obtain And respectively filtering the broadband received signal strength of the at least one frequency channel; and reporting the filtered broadband received signal strength to the base station. The method of claim 1, wherein the plurality of signal strength measurement periods comprise time intervals for performing the wideband measurements regardless of transmissions by the base station on the at least one frequency channel. The method of claim 1, further comprising: identifying the plurality of signal strength measurement periods of the at least one frequency channel based at least in part on the respective timing information, wherein the respective timing information comprises discontinuous reception of one of the UEs A (DRX) loop, a measurement timing configuration indicating a timing of the plurality of signal strength measurement periods, or one or more of a one of a cell discovery reference signal (DRS) configurations. The method of claim 1, wherein performing the wideband measurements on the at least one frequency channel during the plurality of signal strength measurement periods comprises measuring a total power received across a bandwidth of a serving cell, Or one or more of a total power received over a bandwidth of one of the at least one frequency channel currently not used for communication with the UE. The method of claim 1, further comprising: identifying, triggering, reporting the filtered broadband received signal strength to one of the base station reporting events, wherein the reporting event comprises one or more of: the base station A broadband received signal strength measurement value of one of the serving cells is greater than a first threshold, and the broadband received signal strength measurement value of the serving cell is less than a second threshold, and is not currently used by the base station. a broadband received signal strength measurement value of one of the at least one frequency channel of the communication is less than a third threshold, or the broadband received signal strength measurement value of the candidate frequency channel plus a difference The amount is less than the wideband received signal strength measurement of the serving cell. The method of claim 1, wherein the reporting the filtered wideband received signal strength comprises periodically reporting the filtered wideband received signal strength according to a channel selection assistance reporting period. The method of claim 1, wherein the at least one frequency channel comprises at least one candidate frequency channel not currently used by the base station for communication. The method of claim 1, wherein the at least one frequency channel comprises one or more of an unlicensed frequency band. An apparatus for wireless communication, comprising: means for identifying, at a user equipment (UE), a measurement value of a channel selection assistance for at least one frequency channel to a configuration of a base station, Wherein the configuration includes respective timing information of the plurality of signal strength measurement periods of the at least one frequency channel indicating the at least one frequency channel; for the at least one frequency channel during the plurality of signal strength measurement periods The at least one component performing a wideband measurement; means for filtering the wideband measurements to obtain respective filtered wideband received signal strengths of the at least one frequency channel; and A means for reporting the filtered broadband received signal strength to the base station. The apparatus of claim 9, wherein the plurality of signal strength measurement periods comprise time intervals for performing the wideband measurements regardless of transmission of the base station on the at least one frequency channel. The apparatus of claim 9, further comprising: means for identifying the plurality of signal strength measurement periods of the at least one frequency channel based at least in part on the respective timing information, wherein the respective timing information includes the UE A discontinuous reception (DRX) cycle, a measurement timing configuration indicating a timing of the plurality of signal strength measurement periods, or one or more of a one of a cell discovery reference signal (DRS) configurations. The apparatus of claim 9, wherein the component for performing the wideband measurements measures a total power received across a bandwidth of a serving cell or across a current communication not currently used with the UE One of the total powers received by a bandwidth of one of the at least one frequency channel candidate frequency channel. The apparatus of claim 9, further comprising: means for identifying a report event that triggers reporting the filtered broadband received signal strength to one of the base stations, wherein the reporting event comprises one or more of: : a wideband received signal strength measurement value of one of the base stations of the base station is greater than a first threshold, and the broadband received signal strength measurement value of the serving cell is less than a second threshold, and is currently unused. a broadband received signal strength measurement value of the candidate frequency channel of the at least one frequency channel of the communication of the base station is less than a third threshold, or the broadband received signal strength measurement value of the candidate frequency channel A difference is added that is less than the wideband received signal strength measurement of the serving cell. The device of claim 9, wherein the component for reporting is assisted by a channel selection The reported period periodically reports the filtered wideband received signal strength. The apparatus of claim 9, wherein the at least one frequency channel comprises at least one candidate frequency channel that is not currently used for communication by the base station. A method of wireless communication, comprising: configuring, by a base station, at least one UE to report a measurement value for channel selection assistance for at least one frequency channel, wherein the configuration includes an indication of transmitting the at least one frequency channel And respective timing information of a plurality of signal strength measurement periods of at least one frequency channel; receiving, from the at least one UE, UE wideband received signal strength information measured according to the respective timing information; and based at least in part on the UE received signal The intensity interference information identifies a frequency channel for a secondary cell of the base station. The method of claim 16, further comprising: suppressing transmission on the at least one frequency channel for the plurality of signal strength measurement periods. The method of claim 16, further comprising: determining base station broadband signal strength information by measuring signal strength of the at least one frequency channel; and identifying, based at least in part on the base station wideband received signal strength information, for The frequency channel of the secondary cell of the base station. The method of claim 18, wherein the at least one UE comprises a plurality of UEs being served by a primary cell of the base station, and wherein the identifying the frequency channel for the secondary cell comprises based at least in part on the base station The broadband received signal strength information and the received UE wideband received signal strength information determine that one of the lowest combined interference levels is a frequency channel. The method of claim 16, wherein the individual timing information includes the at least one UE a DRX cycle, a measurement timing configuration indicating a timing of the plurality of signal strength measurement periods of the at least one frequency channel, or one or more of a reference signal (DRS) configuration of the at least one frequency channel . The method of claim 16, wherein the configuring the at least one UE comprises transmitting any one of: to the at least one UE: identifying one of the unlicensed bands of one of the communications not currently used for the base station The frequency information of the frequency channel, a wideband received signal strength reporting period, a filter coefficient for filtering the measured wideband received signal strength to obtain one of the filtered wideband received signal strengths, or a combination thereof. The method of claim 16, wherein the at least one frequency channel comprises at least one candidate frequency channel of one of the unlicensed bands of communications not currently used for the base station. An apparatus for wireless communication, comprising: means for configuring at least one UE by a base station to report a measurement value for channel selection assistance for at least one frequency channel, wherein the configuring includes transmitting the at least a respective timing information indicating a plurality of signal strength measurement periods of the at least one frequency channel; and means for receiving, from the at least one UE, the UE broadband signal strength information measured according to the respective timing information And means for identifying a frequency channel for a secondary cell of the base station based at least in part on the received signal strength interference information of the UE. The apparatus of claim 23, further comprising: means for suppressing transmissions on the at least one frequency channel for the plurality of signal strength measurement periods. The apparatus of claim 23, further comprising: means for determining base station broadband signal strength information by measuring signal strength of the at least one of the frequency channels; and wherein the means for identifying is at least partially Broadband reception based on the base station The signal strength information identifies the frequency channel for the secondary cell of the base station. The apparatus of claim 25, wherein the at least one UE comprises a plurality of UEs being served by a primary cell of the base station, and wherein the identifying the frequency channel for the secondary cell comprises based at least in part on the base station The broadband received signal strength information and the received UE wideband received signal strength information determine that one of the lowest combined interference levels is a frequency channel. The device of claim 23, wherein the individual timing information includes a DRX cycle of the at least one UE, a measurement timing configuration indicating a timing of the plurality of signal strength measurement periods of the at least one frequency channel, or One or more of the reference signal (DRS) configurations are found in one of the at least one frequency channel. The apparatus of claim 23, wherein the means for configuring transmits to any of: at least one of the following: identifying a candidate frequency of one of the unlicensed bands not currently used by the base station for communication The frequency information of the channel, a wideband received signal strength reporting period, a filter coefficient for filtering the measured wideband received signal strength to obtain one of the filtered wideband received signal strengths, or a combination thereof. The apparatus of claim 23, wherein the at least one frequency channel comprises at least one candidate frequency channel of one of the unlicensed bands currently not used by the base station for communication.